Wells – Valves – closures or changeable restrictors – Fluid operated
Reexamination Certificate
2007-10-16
2007-10-16
Gay, Jennifer H (Department: 3672)
Wells
Valves, closures or changeable restrictors
Fluid operated
C166S169000, C166S240000, C166S374000, C166S386000
Reexamination Certificate
active
10482773
ABSTRACT:
A downhole apparatus such as multi-cycle circulating subs used during downhole drilling operations includes a piston (42) slidably mounted in a body (4) between positions in which at least one aperture (40) in the body is opened and closed. Movement of the piston (42) is controlled by a pin (86) secured to one of the body and a control member, and a control groove (52) in which a portion of the pin is received formed in the other of the body and control member. An arrangement of elements (32,76) respectively connected to the control member and body is such that, as the control member moves axially, increasing lengths of the elements locate adjacent one another so as to provide resistance to relative rotation in at least one direction of the control member and body. The relative rotation is rotation which presses the control member against the control groove. The risk of damage to the control pin is thereby reduced.
REFERENCES:
patent: 3850250 (1974-11-01), Holden et al.
patent: 3986554 (1976-10-01), Nutter
patent: 4113012 (1978-09-01), Evans et al.
patent: 6109354 (2000-08-01), Ringgenberg et al.
patent: 0092354 (1983-10-01), None
patent: 0222620 (1987-05-01), None
patent: 2309470 (1997-07-01), None
patent: 2314106 (1997-12-01), None
Gillies Ian Alexander
McGarian Bruce
Dykema Gossett PLLC
Gay Jennifer H
Smith International Inc.
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